/*
        Developed by Robert Nyman, http://www.robertnyman.com
        Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/      
var getElementsByClassName = function (className, tag, elm){
        if (document.getElementsByClassName) {
                getElementsByClassName = function (className, tag, elm) {
                        elm = elm || document;
                        var elements = elm.getElementsByClassName(className),
                                nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
                                returnElements = [],
                                current;
                        for(var i=0, il=elements.length; i<il; i+=1){
                                current = elements[i];
                                if(!nodeName || nodeName.test(current.nodeName)) {
                                        returnElements.push(current);
                                }
                        }
                        return returnElements;
                };
        }
        else if (document.evaluate) {
                getElementsByClassName = function (className, tag, elm) {
                        tag = tag || "*";
                        elm = elm || document;
                        var classes = className.split(" "),
                                classesToCheck = "",
                                xhtmlNamespace = "http://www.w3.org/1999/xhtml",
                                namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
                                returnElements = [],
                                elements,
                                node;
                        for(var j=0, jl=classes.length; j<jl; j+=1){
                                classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
                        }
                        try     {
                                elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
                        }
                        catch (e) {
                                elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
                        }
                        while ((node = elements.iterateNext())) {
                                returnElements.push(node);
                        }
                        return returnElements;
                };
        }
        else {
                getElementsByClassName = function (className, tag, elm) {
                        tag = tag || "*";
                        elm = elm || document;
                        var classes = className.split(" "),
                                classesToCheck = [],
                                elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
                                current,
                                returnElements = [],
                                match;
                        for(var k=0, kl=classes.length; k<kl; k+=1){
                                classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
                        }
                        for(var l=0, ll=elements.length; l<ll; l+=1){
                                current = elements[l];
                                match = false;
                                for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
                                        match = classesToCheck[m].test(current.className);
                                        if (!match) {
                                                break;
                                        }
                                }
                                if (match) {
                                        returnElements.push(current);
                                }
                        }
                        return returnElements;
                };
        }
        return getElementsByClassName(className, tag, elm);
};


// Funcionality to display scrolling header

      	var scrollSpeed = 70;       // Speed in milliseconds
	    var step = 1;               // How many pixels to move per step
	    var current = 0;            // The current pixel row
	    var imageHeight = 4300;     // Background image height
	    var headerHeight = 100;     // How tall the header is.
	   
	    //The pixel row where to start a new loop
	    var restartPosition = -(imageHeight - headerHeight);
	   
	    function scrollBg(){
	       
	        //Go to next pixel row.
	        current -= step;
	       
	        //If at the end of the image, then go to the top.
	        if (current == restartPosition){
	            current = 0;
	        }
	       
	        //Set the CSS of the header.
	        jQuery('#header').css("background-position","0 "+current+"px");
	       
	       
	    }
	    // Check if browser is IE6
	    if (window.XMLHttpRequest) {
	       var init = setInterval("scrollBg()", scrollSpeed);
	    }
